Variable-pitch screw weft insertion shaft of rapier loom

Abstract

The utility model provides a rapier loom variable pitch screw wefting insertion shaft, which comprises a connecting end part, a screw body and a spiral part, the connecting end part is connected with a rapier disc through a bearing and ensures normal wefting insertion of a rapier belt wound on the rapier disc; a spiral groove is formed between the spiral part and the screw body, and a sliding block embedded in the spiral groove is clamped on the spiral part; the screw pitch change rule of the spiral part conforms to a preset mathematical function relationship, and the sliding block can drive the weft insertion shaft to rotate, so that the angle and the position of a rapier belt on the rapier disc are driven to change; due to the design, the moving speed and the moving direction of the sliding block in the spiral groove can be accurately controlled, and then the weft insertion movement of the rapier tape is accurately controlled; due to the design of the variable-pitch screw weft insertion shaft, the position and the angle of the rapier belt can be flexibly adjusted in the weaving process, and different weaving requirements are met; accurate weft insertion control is beneficial for reducing defects of the fabric and improving the overall quality and consistency of the fabric.

Description

Technical Field

[0001] The utility model relates to the technical field of textile machinery, in particular to a variable pitch screw weft insertion shaft for a rapier loom. Background Art

[0002] In traditional rapier looms, the insertion of weft yarn is completed by a weft insertion system, and the performance of the weft insertion system directly affects the quality and production efficiency of the fabric. The control of weft yarn tension is one of the key factors in the weft insertion system. In previous designs, the uneven weft yarn tension often led to fabric defects such as weft skew and weft contraction, seriously affecting the quality and appearance of the fabric. In addition, the uneven weft yarn tension may also cause the weft yarn to break during high-speed movement, increasing production costs and downtime. Summary of the Utility Model

[0003] In view of the above-mentioned disadvantages of the prior art, the purpose of the present utility model is to provide a variable pitch screw weft insertion shaft for a rapier loom, which is used to solve the problems of uneven weft yarn tension and high breakage rate in the weft insertion process of traditional rapier looms in the prior art.

[0004] To achieve the above purpose and other related purposes, the present utility model provides the following technical solutions:

[0005] A variable pitch screw weft insertion shaft for a rapier loom includes a connecting end, a screw body, and a spiral part. The connecting end is connected to the sword disc through a bearing to ensure the normal weft insertion of the sword belt wound on the sword disc. A spiral groove is formed between the spiral part and the screw body, and a slider is clamped on the spiral part and embedded in the spiral groove. The pitch change law of the spiral part conforms to a predetermined mathematical function relationship, and the slider can drive the weft insertion shaft to rotate, thereby driving the angle and position of the sword belt on the sword disc to change.

[0006] To implement the above technical solution, the variable pitch screw weft insertion shaft of the rapier loom is connected to the sword disc through its connecting end. The connecting end is equipped with a bearing, ensuring a stable connection with the sword disc, reducing friction and improving weft insertion efficiency; a spiral groove is formed between the spiral part and the screw body, which is a key structural feature of the variable pitch screw weft insertion shaft; the spiral groove provides a guide rail for the slider to ensure the smooth movement of the slider along the spiral groove; the movement of the slider will drive the weft insertion shaft to rotate, which is the direct driving force for realizing the change of the angle and position of the sword belt; the pitch of the spiral part changes according to a predetermined mathematical function relationship, that is, the pitch changes according to a sine function or other mathematical function relationships; this design enables the movement speed and direction of the slider in the spiral groove to be precisely controlled, and then precisely controls the weft insertion movement of the sword belt; the design of the variable pitch screw weft insertion shaft allows the position and angle of the sword belt to be flexibly adjusted during weaving to adapt to different weaving requirements; precise weft insertion control helps to reduce fabric defects and improve the overall quality and consistency of the fabric.

[0007] In one embodiment of the utility model, one end of the screw body away from the connecting end is longer than the spiral portion and forms a smooth rod portion, and the smooth rod portion is mounted on the bearing mounting portion through a bearing, so that the weft insertion axis is arranged horizontally.

[0008] To implement the above technical solution, the smooth rod portion is located at the end of the screw body away from the connecting end. This part has no spiral groove and is a smooth cylindrical surface. The smooth rod portion is mounted on the bearing mounting portion through a bearing. This design allows the weft introduction shaft to rotate smoothly in the horizontal direction, reduces friction and wear caused by gravity or movement, and ensures the horizontal stability of the entire weft introduction shaft. The stable weft introduction shaft arrangement helps to increase the weaving speed and will not reduce production efficiency due to the instability of the weft introduction shaft.

[0009] In one embodiment of the present invention, the connecting end portion includes a thick portion abutting against the screw body and the spiral portion, a large diameter portion connected to the other end of the thick portion and having a smaller diameter than the thick portion, and a small diameter portion located at the other end of the large diameter portion.

[0010] To implement the above technical solution, the thick part is directly connected to the screw body to transmit power and ensure that the spiral part can operate stably. The small diameter part cooperates with the bearing to play a positioning and supporting role to ensure the stability of the weft insertion shaft during operation. The large diameter part is arranged between the thick part and the small diameter part. The design of the large diameter part helps to provide an appropriate transition between the connecting end and the sword disk, thereby reducing stress concentration at the connection.

[0011] In one embodiment of the utility model, a plurality of positioning grooves are formed on the small diameter portion, a chamfer is formed at the end of the small diameter portion along the circumferential direction, and a positioning pin hole is formed at the end of the small diameter portion along the axial direction.

[0012] To implement the above technical solution, a number of positioning grooves are provided on the small diameter portion, and these grooves are used to cooperate with the corresponding structure on the bearing to ensure the accurate positioning of the weft insertion shaft when connected to the sword disk. The end of the small diameter portion is provided with a chamfer along the circumferential direction. This design helps to reduce the connection stress when the connecting end is connected to the sword disk, and also facilitates installation and disassembly; the end of the small diameter portion is provided with positioning pin holes along the axial direction, and these holes are used to insert positioning pins to achieve fixation between the connecting end and the sword disk to prevent axial displacement during weaving.

[0013] In an embodiment of the present invention, a plurality of spring retaining positions are formed on the thick portion.

[0014] To implement the above technical solution, a plurality of retaining spring positions are provided on the thick portion, and these retaining spring positions are used to install retaining springs, so that the position or tension of the weft introduction shaft can be fine-tuned as needed. The elastic force of the retaining spring can provide stable support or pre-tightening force for the weft introduction shaft.

[0015] In an embodiment of the present utility model, the surface of the weft insertion shaft is subjected to nitriding and polishing treatment.

[0016] To achieve the above technical solution, the surface of the weft insertion shaft is subjected to nitriding and polishing treatment, which is a surface hardening technology. By forming a nitriding layer on the metal surface, its hardness and wear resistance are improved. At the same time, lubricating oil is continuously supplied during the contact movement between the weft insertion shaft and the slider. Therefore, shaft wear and slider wear are not easily generated, effectively ensuring the smooth movement of the weft insertion shaft and the slider without generating gaps.

[0017] As described above, the variable pitch screw weft insertion shaft of the rapier loom of the present utility model has the following beneficial effects: through the stable connection of the connection end with the sword disc, the normal weft insertion of the sword belt is ensured, the weft insertion accuracy is improved, and the defects of the fabric are reduced; the surface of the weft insertion shaft is subjected to nitriding and polishing treatment to form a hard nitriding layer, significantly improving the wear resistance and extending the service life; the design of variable pitch of the spiral part can effectively control the acceleration and deceleration of the sword head on the sword belt, ensuring that the tension of the weft yarn remains consistent throughout the introduction process, avoiding fabric defects such as weft skew and weft contraction caused by uneven tension, and improving the overall quality and appearance of the fabric; the uniform tension control helps to reduce the breakage of the weft yarn due to excessive tension during high-speed movement, thereby improving the strength and durability of the fabric. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is shown as the structural schematic diagram of the present utility model.

[0019] Description of Component Labels

[0020] 1. Connection end; 2. Screw body; 3. Spiral part; 4. Spiral groove; 21. Smooth rod part; 11. Thick part; 12. Large diameter part; 13. Small diameter part; 131. Positioning groove; 132. Chamfer; 133. Positioning pin hole; 111. Circlip position. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0021] The following specific embodiments illustrate the implementation manners of the present utility model. Those skilled in the art can easily understand other advantages and effects of the present utility model from the content disclosed in this specification. It should be noted that, without conflict, the following embodiments and the features in the embodiments can be combined with each other.

[0022] Please refer to Figure 1The utility model provides a variable pitch screw weft insertion shaft of a rapier loom, comprising a connecting end 1, a screw body 2, and a spiral portion 3. The connecting end 1 is connected to a rapier disc through a bearing and ensures that the rapier belt wound on the rapier disc can insert weft normally; a spiral groove 4 is formed between the spiral portion 3 and the screw body 2, and a slider embedded in the spiral groove 4 is clamped on the spiral portion 3; the pitch variation law of the spiral portion 3 conforms to a predetermined mathematical function relationship, and the slider can drive the weft insertion shaft to rotate, thereby driving the angle and position of the rapier belt on the rapier disc to change.

[0023] The variable pitch screw weft insertion shaft of the rapier loom is connected to the rapier disc through its connecting end 1. The connecting end 1 is equipped with a bearing to ensure a smooth connection with the rapier disc, reduce friction and improve weft insertion efficiency; a spiral groove 4 is formed between the spiral part 3 and the screw body 2, which is the key structural feature of the variable pitch screw weft insertion shaft; the spiral groove 4 provides a guide rail for the slider to ensure that the slider moves smoothly along the spiral groove 4; the movement of the slider will drive the weft insertion shaft to rotate, which is the direct driving force for achieving the change of the angle and position of the rapier belt; the pitch of the spiral part 3 changes according to a predetermined mathematical function relationship, that is, the pitch changes according to a sine function or other mathematical function relationship; this design allows the moving speed and direction of the slider in the spiral groove 4 to be accurately controlled, and then the weft insertion movement of the rapier belt can be accurately controlled; the design of the variable pitch screw weft insertion shaft allows the position and angle of the rapier belt to be flexibly adjusted during the weaving process to meet different weaving requirements; accurate weft insertion control helps to reduce fabric defects and improve the overall quality and consistency of the fabric.

[0024] Although the peak acceleration and velocity in the motion law of the sword belt have increased slightly compared with the past, the critical speed and acceleration when the sword belt enters the intersection area can be greatly reduced, reducing the inertial force and flutter of the sword belt in the intersection area, which can be more conducive to the smooth intersection of the weft. It has been proven that the weft insertion system based on the variable trapezoidal acceleration design can better meet the requirements of the weft insertion conditions compared to the weft insertion system directly using the modified trapezoidal acceleration design. The designed sword belt displacement curve is the basis for the subsequent inverse calculation of the cross-lead screw helix and the optimization design of the variable lead spiral weft insertion mechanism.

[0025] After the design is completed, ADAMS is used to perform rigid-flexible coupling dynamic simulation on the weft insertion shaft and slider with gaps, and the abnormal motion characteristics of the weft insertion mechanism are analyzed and corrected. After actual use, the database standards are verified and repeatedly formulated, and continuous optimization and improvement are carried out until the use conditions and requirements are met.

[0026] In actual installation operations, the installation of the slider assembly requires certain experience and skills. The locking slider assembly also has strict torque requirements.

[0027] One end of the screw body 2 away from the connecting end 1 is longer than the helical part 3 and forms a smooth rod part 21. The smooth rod part 21 is installed on the bearing installation part through a bearing, and the weft insertion shaft is arranged horizontally.

[0028] The smooth rod part 21 is located at one end of the screw body 2 away from the connecting end 1. This part has no helical groove 4 and is a smooth cylindrical surface. The smooth rod part 21 is installed on the bearing installation part through a bearing. This design allows the weft insertion shaft to rotate smoothly in the horizontal direction, reduces friction and wear caused by gravity or movement, ensures the horizontal stability of the entire weft insertion shaft. A stable arrangement of the weft insertion shaft helps to improve the weaving speed and will not reduce the production efficiency due to the instability of the weft insertion shaft.

[0029] The connecting end 1 includes a thick part 11 that abuts against the screw body 2 and the helical part 3, a large-diameter part 12 connected to the other end of the thick part 11 and having a diameter smaller than that of the thick part 11, and a small-diameter part 13 located at the other end of the large-diameter part 12. The thick part 11 is directly connected to the screw body 2 and is used to transmit power and ensure the stable operation of the helical part 3. The small-diameter part 13 is matched with the bearing to play a role in positioning and supporting, ensuring the stability of the weft insertion shaft during operation. The large-diameter part 12 is arranged between the thick part 11 and the small-diameter part 13. The design of the large-diameter part 12 helps to provide an appropriate transition between the connecting end 1 and the sword disc and reduces stress concentration at the connection.

[0030] A plurality of positioning grooves 131 are provided on the small-diameter part 13. A chamfer 132 is provided along the circumferential direction at the end of the small-diameter part 13, and a positioning pin hole 133 is provided along the axial direction at the end of the small-diameter part 13. A plurality of positioning grooves 131 are provided on the small-diameter part 13. These grooves are used to cooperate with the corresponding structures on the bearing to ensure the accurate positioning when the weft insertion shaft is connected to the sword disc. A chamfer 132 is provided along the circumferential direction at the end of the small-diameter part 13. This design helps to reduce the connection stress when the connecting end 1 is connected to the sword disc and is also convenient for installation and disassembly. A positioning pin hole 133 is provided along the axial direction at the end of the small-diameter part 13. These holes are used to insert positioning pins to realize the fixation between the connecting end 1 and the sword disc and prevent axial displacement during the weaving process.

[0031] A plurality of snap ring positions 111 are provided on the thick part 11. A plurality of snap ring positions 111 are provided on the thick part 11. These snap ring positions 111 are used to install snap rings, and the position or tension of the weft insertion shaft can be finely adjusted as needed. The elastic force of the snap ring can provide stable support or pre-tightening force for the weft insertion shaft.

[0032] The surface of the weft insertion shaft is nitrided and polished. This is a surface hardening technology that forms a nitrided layer on the metal surface to improve its hardness and wear resistance. At the same time, lubricating oil is continuously supplied during the contact movement between the weft insertion shaft and the slider. Therefore, shaft wear and slider wear are not easily generated, effectively ensuring the smooth movement of the weft insertion shaft and the slider without generating gaps.

[0033] In actual use, a continuous and stable lubricating effect is provided for the weft insertion shaft and the slider. The weft insertion shaft is required to be wear-resistant or non-wearing. Regarding the material selection, heat treatment process selection, surface hardening, nitriding and other processes, all aspects need to cooperate closely, which improves the industry standards for each process. The accuracy and reliability of the process affect the friction between the weft yarn and the weft insertion shaft during the conveying process, maintaining a good working state and stability.

[0034] The above embodiments are only illustrative of the principles and effects of the present invention and are not intended to limit the present invention. All equivalent modifications or changes made by those with ordinary knowledge in the technical field without departing from the spirit and technical ideas disclosed by the present invention should still be covered by the claims of the present invention.

Claims

1. The rapier loom variable pitch screw weft insertion shaft includes a connecting end, a screw body, and a helical portion, and is characterized in that: The connecting end is connected to the sword disc through a bearing to ensure the normal weft insertion of the sword belt wound on the sword disc; A spiral groove is formed between the spiral part and the screw body, and a slider embedded in the spiral groove is clamped on the spiral part; The pitch change law of the spiral part conforms to a predetermined mathematical function relationship, and the slider can drive the weft insertion shaft to rotate, so as to drive the angle and position of the sword belt on the sword disc to change.

2. The variable pitch screw weft insertion shaft of a rapier loom according to claim 1, characterized in that: One end of the screw body away from the connecting end is longer than the spiral part and forms a smooth rod part, and the smooth rod part is installed on the bearing installation part through a bearing, and the weft insertion shaft is arranged horizontally.

3. The rapier loom variable pitch screw weft insertion shaft according to claim 1, characterized in that: The connecting end includes a thick part abutting against the screw body and the spiral part, a large-diameter part connected to the other end of the thick part and having a diameter smaller than that of the thick part, and a small-diameter part located at the other end of the large-diameter part.

4. The rapier loom variable pitch screw weft insertion shaft according to claim 3, characterized in that: A plurality of positioning grooves are formed in the small-diameter part, a chamfer is arranged along the circumference at the end of the small-diameter part, and a positioning pin hole is formed along the axis at the end of the small-diameter part.

5. The variable pitch screw weft insertion shaft of a rapier loom according to claim 3, wherein: A plurality of snap ring positions are formed in the thick part.

6. The rapier loom variable pitch screw weft insertion shaft according to claim 1, characterized in that: The surface of the weft insertion shaft is treated by nitriding and polishing.

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